greenplumn CScalarOp 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CScalarOp.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2011 EMC Corp.
/
/ @filename:
/ CScalarOp.h
/
/ @doc:
/ Base class for all scalar operations such as arithmetic and string
/ evaluations
/---------------------------------------------------------------------------
#ifndef GPOPT_CScalarOp_H
#define GPOPT_CScalarOp_H
#include "gpos/base.h"
#include "gpopt/base/CDrvdProp.h"
#include "gpopt/operators/CScalar.h"
#include "naucrates/md/IMDId.h"
namespace gpopt
{
using namespace gpos;
using namespace gpmd;
/---------------------------------------------------------------------------
/ @class:
/ CScalarOp
/
/ @doc:
/ general scalar operation such as arithmetic and string evaluations
/
/---------------------------------------------------------------------------
class CScalarOp : public CScalar
{
private:
/ metadata id in the catalog
IMDId *m_mdid_op;
/ return type id or NULL if it can be inferred from the metadata
IMDId *m_return_type_mdid;
/ scalar operator name
const CWStringConst *m_pstrOp;
/ does operator return NULL on NULL input?
BOOL m_returns_null_on_null_input;
/ is operator return type BOOL?
BOOL m_fBoolReturnType;
/ is operator commutative
BOOL m_fCommutative;
/ private copy ctor
CScalarOp(const CScalarOp &);
public:
/ ctor
CScalarOp(CMemoryPool *mp, IMDId *mdid_op, IMDId *return_type_mdid,
const CWStringConst *pstrOp);
/ dtor
~CScalarOp() override
{
m_mdid_op->Release();
CRefCount::SafeRelease(m_return_type_mdid);
GPOS_DELETE(m_pstrOp);
}
/ ident accessors
EOperatorId
Eopid() const override
{
return EopScalarOp;
}
/ return a string for operator name
const CHAR *
SzId() const override
{
return "CScalarOp";
}
/ accessor to the return type field
IMDId *GetReturnTypeMdId() const;
/ the type of the scalar expression
IMDId *MdidType() const override;
/ operator specific hash function
ULONG HashValue() const override;
/ match function
BOOL Matches(COperator *pop) const override;
/ sensitivity to order of inputs
BOOL FInputOrderSensitive() const override;
/ return a copy of the operator with remapped columns
COperator *
PopCopyWithRemappedColumns(CMemoryPool *, /mp,
UlongToColRefMap *, /colref_mapping,
BOOL /must_exist
) override
{
return PopCopyDefault();
}
/ conversion function
static CScalarOp *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopScalarOp == pop->Eopid());
return dynamic_cast<CScalarOp *>(pop);
}
/ helper function
static BOOL FCommutative(const IMDId *pcmdidOtherOp);
/ boolean expression evaluation
EBoolEvalResult Eber(ULongPtrArray *pdrgpulChildren) const override;
/ name of the scalar operator
const CWStringConst *Pstr() const;
/ metadata id
IMDId *MdIdOp() const;
/ print
IOstream &OsPrint(IOstream &os) const override;
}; / class CScalarOp
} / namespace gpopt
#endif / !GPOPT_CScalarOp_H
/ EOF
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